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Title: Investigating the properties of molecular wires on gold and diamond
Keywords: Molecular electronics;charge transport;organic-inorganic hybrid molecular wire;theoretical simulation;diamond-based solar cell;donor-acceptor dyad
Issue Date: 3-Jun-2009
Citation: NG ZHAOYUE (2009-06-03). Investigating the properties of molecular wires on gold and diamond. ScholarBank@NUS Repository.
Abstract: The self assembly and electron transport properties of various molecular films on different substrates were investigated in this thesis. In Chapter 3, we proved that the two-step strategy of coupling transition metal complexes to pyridine-terminated oligo(phenylene)ethynylene self-assembled monolayer formed well-ordered molecular assemblies using various surface characterization techniques. Electrical measurements revealed enhanced conductivity, rectification and negative differential resistance in the transition metal-OPP molecular films. In Chapter 4, theoretical simulations of the molecular wires based on the first-principles density functional theory and non-equilibrium Greenb s function revealed electrical properties consistent with the experimental results. In Chapter 5, we demonstrated strong rectification in assemblies of molecular dyads comprising a bithiophene segment as the photo-active electron donor and either a C60 or dicyano moiety as the electron acceptor in sandwich device structures. Diamond-based solar cells incorporating 2T-C60 molecular dyads were then studied using impedance spectroscopy under different lighting conditions and various applied dc potentials.
Appears in Collections:Master's Theses (Open)

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